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TPS61220 应用问题

Other Parts Discussed in Thread: TPS61220

tps61220给1节3.6V锂电池升压,升到4.5V,当输出电流30mA时候,TPS61220电压输出被拉低到2.5v左右,看到手册上说可以输出200mA的电流,请问是什么原因导致电压被拉低呢?